you have heard as i have in the last couple of weeks climate change enthusiasts and even some obama administration people saying this is the moment we can move on this. what signs do you see that that may happen? >> it's interesting. i would say that probably the biggest block for some kind of really significant domestic climate change policy in congress is the fact that a lot of republicans are very concerned about the idea of signing on to something that could be an energy tax. there's also a lot of republicans would are skeptical about the idea that climate science is even true, that climate science even exists. republicans control the house. you need 60 votes to get something in the senate. you need 67 votes to get a climate treaty, an international treaty ratified. >> ifill: do you see a movement coming from the white house to kind of boost this? >> well, it will be very interesting to see what the president does. he did... president obama did talk about climate change in his election night speech. there are signs that he thinks about this as kind of a legacy issue. he's someone who cares a l